◎ 题干
—  Where is Bob?I cannot find him anywhere.
— He _____ have been off long. I heard him make a call just now.

 [     ]

A. shouldn't
B. can't
C. mustn't
D. needn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“听录音,选择正确答案。( ) 1. A. I wear my pants and sweater. ( ) 2.A.I like to ski on the snow. ( ) 3. A. It is a cold, snowy day. ( ) 4. A. Because i…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。